Alum ERL 4.125 vs RHS
#7
They do, but how "finished" is it is the question. Probably like some aftermarket parts say direct fit", but still need a little tweaking. Besides, RHS say nothing about the block being deck or align honed. I'm personally going with RHS myself, but I expect to have to do some small prepping though.
Trending Topics
#9
8 Second Club
iTrader: (26)
Tim is right, there is an added cost to finish machine the RHS to your build. The ERL is ready to assemble. ERL is a full service machine shop that has other propriatary products that can really add value to your build. Torington thrust bearings and the best O-ring system available IMHO.
#10
TECH Fanatic
Thread Starter
iTrader: (3)
Join Date: Jan 2008
Location: Corpus Christi Texas
Posts: 1,519
Likes: 0
Received 0 Likes
on
0 Posts
Not familiar with the torington thrust bearing.
I am unaware if I will be O-ringing but it is on the table. Would they only do the block and still use an MLS gasket? or a fire ring setup?
I am unaware if I will be O-ringing but it is on the table. Would they only do the block and still use an MLS gasket? or a fire ring setup?
#12
What about the Dart LS next in Aluminum? Any one know the price for it? Seems like it has potential to be better than both. Ive been looking at the RHS block, since Im a comp dealer, but either will be a nice choice. The RHS does cost more and needs more work upon receipt. ERL sleeves go up to 4.2 bore as well, RHS only4.165
#13
8 Second Club
iTrader: (26)
You would used copper gaskets with the ERL O-ring setup.
You really should call ERL (812 945 3434 ask for the gatekeeper) and get a full workup on what they recomend for your setup. I would also contact comp and see what information and recomendations they can give you.
#14
On The Tree
Join Date: Dec 2004
Location: Northville, Michigan
Posts: 124
Likes: 0
Received 0 Likes
on
0 Posts
For any of you thinking about using a RHS LS block, be sure you have the block qualified before you order your crank, rods, and pistons. After the block has been qualified you may find the deck is below the 9.240" spec that is the nominal for a LS block.
#17
lots of good info, but one question. someone said the RHS block had a better oiling system than the Stock GM/ERL block. what is the problem with the ERL block oiling system? and can this be fixed or made better when ERL does the machining?
#18
On The Tree
iTrader: (3)
Join Date: May 2010
Location: Ga
Posts: 149
Likes: 0
Received 0 Likes
on
0 Posts
By using the stock block as a base such as the ERL route, you are stuck with the factory oiling system. The RHS block uses a priority main system and removes the stupid barbell at the rear in the process. Better system to feed the critical bottom end in the case of low pressure/loss. I think the RHS block is already setup for dry sump should you choose.
#20
TECH Apprentice
iTrader: (16)
Just got my block back from ERL, and it is definitely a nice block. It came with all the plugs and locators. Checked the prep work, and t was truly exceptional. This has to be one of the best value options I've gotten so far. Their block comes ready to assemble. Cam bearings are pressed in, new billet caps are installed, the cylinders are honed to spec., etc. Also for minimal additional cost, you can send the parts to them for preparation or assembly. At 4.125", you'd be surprised at how much material was left in the walls. I think the total prep work alone on my 408 iron block was around $800 not including balancing the rotating assembly, I would say this is an outstanding deal. The only advantage I could see with an RHS block is priority main oiling, but at what level is that really necessary? I'm not doubting the usefulness of it, but the hallowed C5R block uses the production oiling, and it is le meilleur of the LS family. I sent them an aluminum block that I had laying around, so the costs was a lot cheaper than buying the provided core block although it is new, and guaranteed to be without fault.